Some aspects of the reproductive biology of riverine catfish rita, Rita rita (Ham.) were studied from January to December, 2006. Gonado-somatic index was calculated and fecundity was determined by gravimetric method. During the study period, the highest monthly average value of gonado-somatic index was observed to be 0.52±.04 for the month of July, followed by 0.43±.05 for the month of June. The lowest fecundity of 9,646 was recorded in the fish having 21.50 cm in length and 345.25g in weight. The highest fecundity of 70,200 was recorded in the fish having 41.55 cm in length and 1,350.50 g in weight. The fecundity was found to increase with the increase in total length following the equation, Y= 3,287.7X-71,984 with r = 0.97 and the fecundity was also found to increase with the increase in body weight following the equation, Y= 63.666X-14,302 with r = 0.94. It was found to increase with the increasing ovary weight following the equation, Y=13,025X+5,896.4 with r = 0.99. The relationship between fecundity and total length, body weight and ovary weight of the fish was found to be linear and significant.